cgroup_migrate
DECLARE_EVENT_CLASS(cgroup_migrate,
DEFINE_EVENT(cgroup_migrate, cgroup_attach_task,
DEFINE_EVENT(cgroup_migrate, cgroup_transfer_tasks,
int cgroup_migrate(struct task_struct *leader, bool threadgroup,
ret = cgroup_migrate(task, false, &mgctx);
ret = cgroup_migrate(leader, threadgroup, &mgctx);